docs: def _get_deltas(self, rake):
          """
          Return the value of deltas (delta_R, delta_S, delta_V, delta_I),
          as defined in "Table 5: Model 1" pag 198
          """
          # All deltas = 0 for DowrickRhoades2005SSlab Model 3: Deep Region,
          # pag 198
  
          delta_R, delta_S = 0, 0
          delta_V, delta_I = 0, 0
  
          return delta_R, delta_S, delta_V, delta_I